I'm Bob Supnik, a long-time veteran of DEC, now retired. My hobby is simulating historical systems (SimH - http://simh.trailing-edge.com) and bring up ancient software. The 18bit PDP family (PDP-1, PDP-4/7/9/15) has been a particular focus.

The 18bit PDPs were the original home of MUMPS, but except for a partial assembly listing on BitSavers and a few manuals, all traces of the original MUMPS systems have vanished. MUMPS-15 is the last major operating systems for the 18bit PDPs that is still missing. If you have any artifacts from that era - listings, manuals, or better yet, source tapes - please let me know.

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